In a YouTube video posted on Thursday, the “Celebrity Apprentice” host, who’s flirted with a possible GOP presidential run, is seen sitting in a chair on the roof of Trump Tower in New York.

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“Like everybody’s going crazy over this thing,” Trump says of the challenge, which raises money for amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig’s disease. Participants capture video of themselves either dumping a bucket filled with ice water over their heads, or they make a donation to an ALS charity. They then nominate others to do the same.

“I guess they want to see whether or not it’s my real hair — which it is,” Trump opines to the camera, as to the reason he was nominated (including by Homer Simpson, boxer Mike Tyson and World Wrestling Entertainment’s Vince McMahon).

The reigning Miss Universe and Miss USA — pageants owned by Trump, as he dutifully points out in the clip — were given the honors of flipping a bottled water-filled bucket over their boss’ head.

The outspoken businessman has been a longtime critic of Obama, once offering the president a $5 million charity donation if he released his passport and college records.

Ethel Kennedy was one of the first high-profile ALS ice bucket challenge participants to nominate Obama earlier this month. A White House spokesman told The Hill at the time that Obama’s “contribution to this effort will be monetary.”